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DJGPP: Avoid leaking memory on lowmem mapping error

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Add a clarifying comment about why low memory is never unmapped.

Corresponding to flashrom svn r1195.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Rudolf Marek <r.marek@assembler.cz>
This commit is contained in:
Carl-Daniel Hailfinger 2010-10-05 23:21:51 +00:00
parent 1db7a448b3
commit 602de9829c
1 changed files with 5 additions and 1 deletions
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6
physmap.c
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@ -56,6 +56,8 @@ static void *map_first_meg(unsigned long phys_addr, size_t len)
} }
if (__djgpp_map_physical_memory(realmem_map, (1024 * 1024), 0)) { if (__djgpp_map_physical_memory(realmem_map, (1024 * 1024), 0)) {
free(realmem_map);
realmem_map = NULL;
return ERROR_PTR; return ERROR_PTR;
} }
@ -95,7 +97,9 @@ void physunmap(void *virt_addr, size_t len)
{ {
__dpmi_meminfo mi; __dpmi_meminfo mi;
/* we ignore unmaps for our first 1MB */ /* There is no known way to unmap the first 1 MB. The DPMI server will
* do this for us on exit.
*/
if ((virt_addr >= realmem_map) && ((virt_addr + len) <= (realmem_map + (1024 * 1024)))) { if ((virt_addr >= realmem_map) && ((virt_addr + len) <= (realmem_map + (1024 * 1024)))) {
return; return;
} }